Secondary battery and electronic device

Active Publication Date: 2011-10-13
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0024]According to the first secondary battery of the present invention, since at least one of the cathode, the anode, and the electrolyte contains the compound shown in Formula (1) or the nitrile compound shown in Formula (2), the chemical stability thereof is improved. Thereby, at the time of electrode reaction, the electrode reactant is easily inserted and extracted in the anode or the cathode, and decomposition reaction of the electrolyte is inhibited. Thus, the battery characteristics such as the cycle characteristics are able to be improved. Accordingly, the first secondary battery of the present invention is able to be suitably used, for example, as a power source for an electronic device such as a portable electronic device, an electric power tool, and a power source supply system.
[0025]According to the second secondary batter

Problems solved by technology

However, although various studies have been made as described above, sufficient battery characteristics such as the cycle characteristics and the swollenness characteristics have not been obtained

Method used

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first embodiment

[0048]A secondary battery according to a first embodiment of the present invention includes an electrolyte together with a cathode and an anode. The cathode contains a cathode active material capable of inserting and extracting an electrode reactant. The anode contains an anode active material capable of inserting and extracting the electrode reactant. Further, the electrolyte contains a solvent and an electrolyte salt dissolved therein. In particular, at least one of the cathode, the anode, and the electrolyte contains a compound shown in Formula (1) (hereinafter referred to as “radical scavenger compound” as well). In this case, only one of the radical scavenger compounds shown in Formula (1) may be contained, or two or more thereof may be contained.

(x is a group with (a+b) valency having a radical scavenger function, and M is a metal element. a and b are an integer equal to or more than 0. c, d, and e are an integer equal to or more than 1. (a+b)≧1 is satisfied.)

[0049]In the case...

second embodiment

[0259]In a secondary battery according to a second embodiment of the present invention, at least one of the cathode, the anode, and the electrolyte contains a nitrile compound shown in Formula (2). In other words, the secondary battery of this embodiment has a structure similar to that of the secondary battery of the first embodiment, except that the nitrile compound shown in Formula (2) is used instead of the radical scavenger compound shown in Formula (1). In this case, only one of the nitrile compounds shown in Formula (2) may be contained, or two or more thereof may be contained.

(R1 is a group with (a1+b1+c1) valency composed of an element selected from the group consisting of hydrogen, oxygen, and halogen elements and carbon, and M1 is a metal element. a1, d1, f1, and e1 are an integer equal to or more than 1. b1 and c1 are an integer equal to or more than 0. (b1+c1)≧1 is satisfied.)

[0260]The introduction form of the nitrile compounds shown in Formula (2) to the cathode, the an...

third embodiment

[0311]A secondary battery according to a third embodiment of the present invention includes a cathode, an anode, and an electrolyte, and at least one of the cathode and the anode contains one or more compounds out of compound shown in Formula (3). In other words, the secondary battery of this embodiment has a structure similar to that of the secondary battery in the first embodiment, except that the compound shown in Formula (3) is used instead of the radical scavenger compound shown in Formula (1), and the component containing the compound is at least one of the cathode and the anode.

(R1 is a group with (a1+b1) valency including at least one of a benzene ring and a cyclohexane ring in the range from 2 to 5 in total. X1 and Y1 are a halogen group, a hydroxyl group, or a group expressed by —OM1. a1 and b1 are an integer equal to or more than 0. M1 is an alkali metal, an alkali earth metal, or an alkylsilyl group. a1 and b1 satisfy (a1+b1)≧1.)

[0312]The introduction form of the compoun...

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Abstract

A secondary battery capable of improving battery characteristics is provided. The secondary battery includes a cathode 21 containing a cathode active material capable of inserting and extracting an electrode reactant, an anode 22 containing an anode active material capable of inserting and extracting the electrode reactant, and an electrolyte containing a solvent and an electrolyte salt. At least one of the cathode 21, the anode 22, and the electrolyte contains a radical scavenger compound. The radical scavenger compound is a compound in which a group having a radical scavenger function exists as a matrix, to which one or more carboxylic metal bases or one or more sulfonic metal bases are introduced. Chemical stability of the cathode 21, the anode 22, or the electrolyte containing the radical scavenger compound is improved. Thus, at the time of charge and discharge, decomposition reaction of the electrolytic solution is easily inhibited.

Description

TECHNICAL FIELD[0001]The present invention relates to a secondary battery including a cathode, an anode, and an electrolyte and an electronic device including a secondary battery.BACKGROUND ART[0002]In recent years, portable electronic devices such as a video camera, a digital still camera, a mobile phone, and a notebook personal computer have been widely used, and it is strongly demanded to reduce their size and weight and to achieve their long life. Accordingly, as a power source for the portable electronic devices, a battery, in particular, a light-weight secondary battery capable of providing a high energy density has been developed.[0003]Specially, a secondary battery using insertion and extraction of lithium ions for charge and discharge reaction (so-called lithium ion secondary battery) is in practical use widely, since such a lithium ion secondary battery is able to provide a higher energy density than a lead battery and a nickel cadmium battery.[0004]The lithium ion seconda...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/056H01M4/131H01M4/133H01M4/136H01M10/052H01M10/0567
CPCH01M4/131H01M4/133Y02E60/122H01M10/052H01M10/0567H01M4/136Y02E60/10
Inventor YAMAGUCHI, HIROYUKISAITO, SHUNSUKEODANI, TORUIHARA, MASAYUKIKUBOTA, TADAHIKO
Owner MURATA MFG CO LTD
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